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"In the New England electorate I am the only candidate who stuck up their hand for preselection," Mr Joyce said.

The process was introduced after a number of MPs across several parties were found to be ineligible because they held dual citizenship - including Mr Joyce.

"He's got to get through that like everyone else," Mr Anthony told AAP.

"I have every confidence that he'll get through that process."

Nationals leader Michael McCormack said Mr Joyce had the support of his party colleagues.

"He's going through the normal vetting processes as is the case with all National party candidates, whether they're a candidate, whether they're a sitting member, indeed whether they're the deputy prime minister as I am," he told reporters in Queensland.

"I went through the same vetting process and you have to fill out a long and involved form, and you have to make certain undertakings."

Mr Anthony says the preselection for New England will be held on November 17, and a couple of hundred local Nationals members will vote.

Labor shadow treasurer Chris Bowen said he wasn't surprised Nationals preselectors were having second thoughts.

"Barnaby Joyce is the most overrated politician in modern Australia," he told reporters.

Mr Joyce won a by-election in 2017 forced by the discovery of his dual citizenship.

Prime Minister Scott Morrison appointed Mr Joyce as special envoy for drought assistance when he took over from Malcolm Turnbull.